DIAMOND-BACK TERRAPIN CULTURE 
31 
Table 2. — Average number of eggs produced per female of the brood of 1909 1 
Year 
Eggs 2 
Year 
Eggs 2 
Year 
Eggs 2 
1Q1 *» 
24.0 
1920- 
35.0 
1924... 
22.0 
IQIfi 
29. 5 
1921 
32.3 
1925 3 
29.8 
1917 
24. 5 
1922 
29.4 
1Q18 
29.2 
1923 . 
33.0 
Average 
29. 4 
1919 
34.3 
1 Those animals hibernated each winter. 
2 All of the females in this lot were tpA inches in length or longer during the entire period. 
3 Discontinued after 1925. 
Table 3. — Average number of eggs produced per female of the brood of 1910 
Year 
Fed first winter 
Hibernated each 
winter 
Year 
Fed first winter 
Hibernated each 
winter 
Entire 
lot 
All bYi 
inches 
and over 
in length 1 
Entire 
lot 
All 5J4 
inches 
and over 
in length 2 
Entire 
lot 
All 5^ 
inches 
and over 
in length 1 
Entire 
lot 
aii sy 2 
inches 
and over 
in length 1 
1915 
0.3 
5.7 
8. 1 
7.6 
11. 1 
9.5 
6.6 
8.1 
1.4 
13.4 
1923 
6.1 
6.0 
5. 1 
6.5 
9.2 
4.0 
3.5 
3.2 
3.2 
3.6 
1916 
0.4 
2.9 
4.2 
7.1 
5. 1 
2. 1 
5.2 
4.2 
11.3 
1924 
1917 
1925 
5.9 
4.4 
1918 
12.3 
16.2 
1926 
1919 
13. 2 
1927 
1920_ __ 
Average 
2 6. 9 
9.8 
2 3.8 
8.3 
1921_ 
1922 
1 Female terrapins less than 5J4 inches long apparently do not lay eggs. Therefore, the rate of production shown in this column 
is the actual rate per sexually mature female. Measurements of the size of the terrapins are not available for every year and, there- 
fore, the rate of egg production per mature female can not always be given. 
2 The first year of egg production is not considered in determining this average, as only a few eggs were produced and nearly 
all of the females were still immature. 
Table 4. — Average number of eggs produced per female of the brood of 1911 
Year 
Fed first 3 winters 
Hibernated each 
winter 
Year 
Fed first 3 winters 
Hibernated each 
winter 
Entire 
lot 
All 5'A 
inches 
and over 
in length 1 
Entire 
lot 
All 5A 
inches 
and over 
in length 2 
Entire 
lot 
All 5 y 2 
inches 
and over 
in length 1 
Entire 
lot 
All 5J4 
inches 
and over 
in length 2 
1915 
0. 1 
0.8 
1923 
7. 1 
8. 7 
11. 2 
1916 
0. 1 
0.3 
1924 
6.8 
8.0 
1917 
5.3 
1925. .. 
4.3 
5. 5 
7. 5 
9.3 
1918 
7. 6 
0. 7 
1. 5 
1926... 
8.6 
8.6 
1919 
11.9 
18.0 
2.3 
4.8 
1927 
7.8 
11.6 
1990 
8 1 
5 6 
1921 
4.2 
6. 9 
Average 
2 6. 0 
6. 1 
6. 7 
6. 7 
1922 
6. 5 
7.1 
1 Female terrapins less than 5J4 inches long apparently do not lay eggs. Therefore, the rate of production shown in this column 
is the actual rate per sexually mature female. Measurements of the size of the terrapins are not available for every year and, there- 
fore, the rate of egg production per mature female can not always be given. 
2 The first 2 years of egg production are not considered in determining this average, as only a few eggs were produced and nearly 
all the females were still immature. 
35006—29 2 
